how to link area with blockatt

[peysey]

Oke guys, here it comes:

I have many hatches in a drawing and I define those hatches (areas) with my own block that has some attributes (area number, area name, area m²).
So I paste this block manually on every single hatch that stands for a room area. After that, I have my ways to easily give it a number and a name.
To fill in the m² attribute, I select this att and insert a field for the area of the hatch I aim to. That is great, but I have to do it for every hatch one by one!

There are LISP's that can provide you easily the m² of selected hatches, but that makes a Mtext.. That doesn't work for me.
I want to use my own block that consists:
ATT 1 for number
ATT 2 for name
ATT 3 for m²

So I know I have to do something with ATT 3, with linking this field to the hatch or something? How? Or is there another way that works?
I prefer LISP (trying to learn) and not an app or something. Just native Autocad please

I hope someone can help me with this.

BR,

Sef

[Tom Beauford]

Any lisp that places area in text or mtext could just as easily place it in in a block attribute. Having all the area attribute definition tag names the same would be easiest.
I use fields for areas and lengths. If an endpoint or vertex is modified a regen or plot will update the value. Copying an object with it's field area label to another breaks the field reference and it's display.

No matter which way you go units affect calculations the most so checking those values in the lisp might be needed to be changed if your find code by someone whose settings are different than yours.